Goose barnacle — about $300 per 1 kg (2.2 lbs)
Though Goose barnacles are called mollusks, they are actually crustaceans. When in their natural habitat, they stick firmly to rocks and it’s only possible to unstick them by hand, by knocking them off with a sharp knife. Collecting goose barnacles carries a deadly risk: a person can slip on the stones that are covered with wet moss and algae, and fall. The pale-pink meat of this crustacean tastes like something between a lobster and an oyster. They’re eaten either steamed, boiled, or raw.
i swear if you got dirt off the top of mount Everest (or told rich people that's wear you got it from) you could get them to eat it by telling them it has natural nutrients not found at ground level